Abstract
We study a semilinear elliptic equation Au = f(x, u) with nonlinear Neumann boundary condition Bu = φ(ξ, u) in an unbounded domain Ω ⊂ ℝn, the boundary of which is defined by periodic functions. We assume that f and φ and the coefficients of the operators are asymptotically periodic in the space variables. Our main result states the existence of an asymptotically decaying, nontrivial solution of this problem with minimal energy. The proof is based on the concentration-compactness principle.
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Pflüger, K. Remarks on Nonlinear Neumann Problems in Periodic Domains. Results. Math. 31, 365–373 (1997). https://doi.org/10.1007/BF03322170
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DOI: https://doi.org/10.1007/BF03322170